Best raid level for backup exec local storage

I am upgrading the storage for our backup exec server. I am adding

8 X 500GB 6gb SAS 7200 rpm  sff drives.

What raid level is will give me the fastest restores?

I also will be using an lto6 autoloadler (HP MSL2024)

I wanted to do raid 10 but a raid 10 controller can get very expensive.

Will raid 5 work just fine?

Thanks.